Manufacture of single-spiral augers.



No. 846,113. PATENTED MAR. 5, 1907,.

I A. KRIEGER.. MANUPAGTURE 0F SINGLE SPIRAL AUGERS.

APPLICATION FILED JAIL 29, 1906.

2 SHEETS-SHEET l ATTORNEYS No. 846,113 PATENTED MAR. 5, 1907.

' A. KRIEGER:

MANUFACTURE OF SINGLE SPIRAL AUGERS.

APPLICATION TILED JAN.29,1906.

2 SHBBTSSHEET 2.

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ANDREW KRIEGER, OF COLUMBUS, OHIO.

MANUFACTURE OF SINGLE-SPIRAL AUGERS.

Specification of Letters Patent.

Patented March 5,1907.

Application filed January 29,1906. Serial No. 298,405.

T 0 all whom it may concern:

Be it known that I, ANDREW KRIEGER, a citizen of the United States,residing at O0- lumbus, in the county of Franklin and State of Ohio,have invented certain new and useful Improvements in the Manufacture ofSingle-Spiral Angers, of which the following is a specification. 7

My invention relates to a new and useful method of manufacturing angers.

The object of the invention is to provide a method of manufacturingangers comprising a single-spiral body portion having a doublespiralcutting-head at a single operation.

Further objects and advantages of the invention will be set forth in thedetailed description which now follows.

In the accompanying drawings, Figure 1 is a face view of one of thehalf-dies. Fig. 2 is a similar view of the other half-die. Fig. 3 is arear end elevation of the half-dies in their Fig. 4 is a front elevationof the same. Fig. 5 is a plan view of an auger-blank. Fig. 6 is a planview of the same after the single spiral has been formed. Fig. 7 is aplan view of the auger after the single and double spirals have beenformed. Fig. 8 is a transverse vertical sectional view through the dies,showing in elevation the auger supported during the punching operationand the punch in engagement with the end of the same. Fig. 9 is a sideelevation of the punch, the lower portion being shown in section toillustrate the point-receiving concavity; and Fig. 10 is an end view ofthe punch.

In the drawings the numerals 1 and 2 represent upper and lower halfdies,respectively.

Each of these dies are formed in their faces with semicylindricalgrooves 3 and 4, two of such grooves being provided in each half-die andextending longitudinally thereof. These grooves are so disposed thatwhen the faces of the dies are brought together the groove 4 of one diewill register with the groove 4 of the other die and likewise the groove3 will register with the other groove 3, thus providing two cylindricalpassages or openings, as shown in Figs. 3 and 4.

The grooves 3 may-be properly designated as roughening-grooves and areonly used under certain conditions when it is desirable. I have shownthem more especially to illustrate the present method of formingsinglespiral angers. Within these grooves the usual curved and roundedribs or crimps 5 are provided and spaced in the usual manner, so thatthe grooves 3 provide the necessary spaces therebetween. However, informing these ribs or crimps I position them so as to leave the forwardportion 6 of each groove 3 unobstructed, thereby providing a cylindricalopening of such length as to receive the head or stop portion of theanger and also to provide a gage to guide the operator in forming thesingle spiral. This ga e is formed by the forward edges 7 of thehalf-dies and the grooves, and by bringing the extreme end of thetapered point 8 of the anger in line with the said edge 7 the operatorwill know that he has twisted the bit back through the dies to the rightpoint. By this provision he is not compelled to rely on his judgment andis prevented from running the single spiral into the head portion 11.

In Fig. 5 Ihave shown the usual augerbla'nk, which comprises theenlarged cylindrical body portion 9, the shank 10, and the stock or headportion 11. In forming the auger this blank is headed and placed betweenthe half-dies, which latter are suitably held in a trip-hammer, so as tobe quickly separated and brought together in short light strokes. Theblank is placed between the grooves 3 and the ribs 5, with its stockportion well forward, so that the first spirals are formed nearer theshank 10. The anger is twisted or turned so that it is run through thedies back and forth, the spiral thus being gradually and continuouslyformed. As before stated, the operator has heretofore been compelled touse his judgment and guess just how far to run the bit back withoutrunning the single spiral into the head 11 but by provision of thecylindrical portion 6 and the edges 7 he is enabled to gage just how farto run the auger back by bringing the tip end of the point 8 in linewith the said edges. The auger thus treated is brought to the shape andform shown in Fig. 6, the cylindrical ortion 9 having been formed intothe spira 12. It has been customary to reheat the auger and then placethe stock portion 11 between dies arranged in a press, which whenbrought together compress and flatten out the stock. The anger is againheated and clamped between what is known as header-dies. A punch is thenbrought into engagement with ICC . ribs in the lower half-die 2 and onein the upthe flattened stock and the double or auxiliary spiral,together with the spur and lips formed by compression and upsetting ofthe stock. However, after going through these operations and beingheated three times the auger is not finished, but must be milled, filed,polished, and straightened, and very often the augers .must be discardedon account of flaws and imperfections resulting from the stamping and.upsetting operation.

As I have before stated, the grooves 3 and the ribs 5 may be used, ifdesired, for heavy work or bringing the blank to the form shown in Fig.6. However, I prefer to form both the single and double spirals at asingle 0 eration and with one heating. In accompl ishing this I providethe grooves 4 with ribs 14, shaped and spaced exactly like the ribs 5,However, the said ribs 14 are positioned at different points along thegrooves 4 from the points occupied by the ribs 5. This is done to permitthe forward edges 7 of the die at the end of the grooves 4 to be used asa gage and also to allow room for the double-spiralforming ribs orcrimps. These double-spiraly forming ribs are indicated by the numerals15 and 16, there preferably being two of said per half-die 1. The tworibs 1.5 occupy with their inner space or curved recess 17 substantiallythe same space as one of the ribs 14 so that the single spirals formedby the ribs 14 will pass over the ribs 1.5, engaging the outermost facesor sides of the same. The rib 16 is also disposed so that exactly thesame form of recess is formed between its side and the nearest rib 14 asbetween the said rib 14 and the other rib 14. It will thus be apparentthat the single spirals formed by the ribs 14 may be readily run overthe ribs 15 and 1.6 without being altered in shape. However, these ribs15 and 16 are designed for the purpose of forming the auxiliary ordouble spiral at the head'of the auger and doing away with the usualstamping or pressing operation and the subsequent compressing andupsetting in header-dies.

Since the two double spirals at the head of the auger shown in Fig. 7are formed in a space equal to that occupied by one of the singlespirals, it follows that more stock must be provided at the head of theblank 9 to permit of these double spirals being formed, and it is forthis purpose that the enlarged head 11 is provided.

It is to be understood that the blank shown in Fig. 5 is of smallerdiameter than the openings or channels through the dies. This isnecessary by virtue of the fact that some of the metal of said blankwill be pressed out of the grooves and into the ribs 12. The same thingis true of the head 11, grooves being formed in said head to produceribs between them, said ribs forming the double spirals.

In forming the double and single spirals simultaneously the blank shownin Fig. 6 is placed in the groove 4 of the lower die 2. (See Fig. 2.)The blank is so positioned that the top of its tapered point 8 lies inline with the front edge 7 of the die, while the stock 11 rests on. theribs 15. It is to be noted that the ribs 15 are not so high as the ribs14 and are tapered upwardly to a comparativel y sharp edge, which isgiven a slight twist to facilitate the production of the double spiral.These ribs are also cut on a diiferent radius from the ribs 14. Thehalf-die 1 (shown in Fig. 1) is inverted and placed in the hammer orother machine so as to come down onto the auger and the lower half-die2. This inverting of the upper half-die causes its ribs 14 to extenddiagonally in the opposite direction from the lower ribs, thus providingthe single spiral. The rib 16, which is of the same shape anddisposition as the ribs 15, extends diagonally across the interspace 17from the innermost rib and across the outermost rib, thus forming thedouble spiral. As before stated, the stock 11, resting on the ribs 15,will of course be impinged and impressed by the rib 16 when the upperdie is brought down and the ribs 15 also impressed into the stock, thedouble or auxiliary spiral thus being started. The ribs 14 coact-ingwill make the first impressions of the single spirals 12. The operatorimmediately begins to twist the auger and run the same back and forth,so as to cause the spirals to be formed smooth and continuous,.the diesof course being reciprocated in the usual manner during this twistingoperation. By this operation the auger is brought to the form sh own inFig. 7- and the spirals. both single and double, perfectly formed, sothat milling to form the double spiral is obviated. In twisting theauger through the dies it is possible to carry the double spiral backsome distance, so that the same may be given considerable length, ifdesired. This lengthening of the double spiral could be extended to amuch greater degree by providing additional ribs 15 and 16, which ofcourse can be done, if so desired.

It will be apparent that the operator may at all times know the exactcondition of his work by the gage provided by the edges 7 of the dies.Considerable care must be exercised in twisting or running the augerbackward, so as not to bring the rear ends of the auxiliary spirals 18into contact with the ribs 14, which would result in bending and mashingsaid spirals. However, when the edge 7 is used as a this cannot occur.While the rearward twist or run of the auger is limited, it may be runor twisted forward as far as desired, as the single spirals 12 willreadily ride over the ribs 15 and against the forward side of the rib16. From the foregoing it is obvious that the auger-blank is reduced orconverted from its incomplete form shown IIS in Fig. 5 to the form shownin Fig. 7 by a single continuous operation and with one heatmg.

After the auger has been brought to the form shown in Fig. 7, thehalt-dies 1 and 2 or duplicates of the same are placed in a heading-press or other machine, which is arranged to suitably hold thediesand open and close the same to receive and hold the anger inposition. In Fig. 8 the dies are shown in the position they occupy whenclosed in the heading-press. It will be noted that the auger, althoughplaced in a vertical position as well as the dies, is securely supportedat every point, each of the convolutions of the single spiral 12 restingagainst one of the ribs-14 and the double spirals resting against theribs 15 and 16. The auger thus being securely held cannot be bent duringthe heading operation. In carrying out the heading operation or to formthe spurs 19 and the lips 20, I provide a heading-punch 21, the latterhaving such shape and contour as to freely fit within-the cylindricalopening provided by the upper ends of the grooves 4. This punch on itslower end is provided with ratchet-like projections 22 and with acentral upwardly-tapering recess 23. ()n diametrically opposite sidesand central of the projections 22 spur-forming recesses 24 are provided.This punch is placed in the press and caused to descendon the upper endof the anger, the same of course having the form shown inFig. 7 andbeing engaged by the punch. As the punch descends the ta-- pered point 8is received in the tapered recess 23, while the metal in the stock 11 isupset, compressed, and cut, so that the lips 20 are formed by theratchet-like projections 22 and the spurs 19 by the recesses 24, intowhich the metal of the stock is crowded or upset during the punchingoperation.

It is to be observed that the double spiral 18 is securely supported bythe ribs 15 and 16 and cannot bend or be forced out of shape during thepunching operation. The punch is now withdrawn and the halfdiesseparated, so as to permit the. removal of the auger therefrom. Verylittle finishing is re quired, it being merely necessary to sharpen thespurs and lips slightly and carry out the usual polishing and truingoperations.

I wish to make it clear that by my process and apparatus the augers arenot dropforgedthat is, so far as the spirals are concernedand that thelatter are formed by turning the auger back and forth between thehalt-dies, which are separated and brought together by quick, short,light strokes, which has the effect of merely tapping the auger, so asto gradually form the spiral.

What I claim is The method of making angers, which consists in forming ablank having a substantially cylindrical body with an end portion ofslightly greater diameter than that of the body, die-forging asingle-spiral groove in the body, and double-spiral grooves in theenlarged end portion of less depth and width than the groove in thebody, substantially as and for the purpose set forth.

In testimony whereof I afliX my signature in presence of two witnesses.

ANDREW KRIEGER.

Witnesses:

A. L. PHELPs, M. B. ScnLnY.

